Commit b85ff59e authored by Laurent COLBOIS's avatar Laurent COLBOIS
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Added data and protocols description for Multipie

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.. _bob.bio.face.learderboard.multipie:
.. _bob.bio.face.leaderboard.multipie:
================
Multipie Dataset
================
.. todo::
Benchmarks on Multipie Database
Probably for Manuel's students
\ No newline at end of file
Probably for Manuel's students
Database
========
The `CMU Multi-PIE face database <http://www.cs.cmu.edu/afs/cs/project/PIE/MultiPie/Multi-Pie/Home.html>`_ contains more than 750,000 images
of 337 people recorded in up to four sessions over the span of five months. Subjects were imaged under 15 view points and 19 illumination
conditions while displaying a range of facial expressions. In addition, high resolution frontal images were acquired as well.
In total, the database contains more than 305 GB of face data.
Content
*******
The data has been recorded over 4 sessions. For each session, the subjects were asked to display a few
different expressions. For each of those expressions, a complete set of 30 pictures is captured that includes
15 different view points times 20 different illumination conditions (18 with various flashes, plus 2 pictures with no flash at all).
Available expressions
---------------------
* Session 1 : *neutral*, *smile*
* Session 2 : *neutral*, *surprise*, *squint*
* Session 3 : *neutral*, *smile*, *disgust*
* Session 4 : *neutral*, *neutral*, *scream*.
Camera and flash positioning
----------------------------
The different view points are obtained by a set of 13 cameras located at head height, spaced at 15° intervals,
from the -90° to the 90° angle, plus 2 additional cameras located above the subject to simulate a typical
surveillance view. A flash coincides with each camera, and 3 additional flashes are positioned above the subject, for a total
of 18 different possible flashes.
The following picture showcase the positioning of the cameras (in yellow) and of the flashes (in white).
.. image:: img/multipie_setup.jpg
:width: 620px
:align: center
:height: 200px
:alt: Multipie setup
File paths
----------
The data directory structure and filenames adopt the following structure:
.. code-block:: shell
session<XX>/multiview/<subject_id>/<recording_id>/<camera_id>/<subject_id>_<session_id>_<recording_id>_<camera_id>_<shot_id>.png
For example, the file
.. code-block:: shell
session02/multiview/001/02/05_1/001_02_02_051_07.png
corresponds to
* Subject 001
* Session 2
* Second recording -> Expression is *surprise*
* Camera 05_1 -> Frontal view
* Shot 07 -> Illumination through the frontal flash
Protocols
*********
Expression protocol
-------------------
**Protocol E**
* Only frontal view (camera 05_1); only no-flash (shot 0)
* Enrolled : 1x neutral expression (session 1; recording 1)
* Probes : 4x neutral expression + other expressions (session 2, 3, 4; all recordings)
Pose protocol
-------------
**Protocol P**
* Only neutral expression (recording 1 from each session, + recording 2 from session 4); only no-flash (shot 0)
* Enrolled : 1x frontal view (session 1; camera 05_1)
* Probes : all views from cameras at head height (i.e excluding 08_1 and 19_1), including camera 05_1 from session 2,3,4.
Illumination protocols
----------------------
N.B : shot 19 is never used in those protocols as it is redundant with shot 0 (both are no-flash).
**Protocol M**
* Only frontal view (camera 05_1); only neutral expression (recording 1 from each session, + recording 2 from session 4)
* Enrolled : no-flash (session 1; shot 0)
* Probes : no-flash (session 2, 3, 4; shot 0)
**Protocol U**
* Only frontal view (camera 05_1); only neutral expression (recording 1 from each session, + recording 2 from session 4)
* Enrolled : no-flash (session 1; shot 0)
* Probes : all shots from session 2, 3, 4, including shot 0.
**Protocol G**
* Only frontal view (camera 05_1); only neutral expression (recording 1 from each session, + recording 2 from session 4)
* Enrolled : all shots (session 1; all shots)
* Probes : all shots from session 2, 3, 4.
Benchmarks
==========
Run the baselines
*****************
Leaderboard
***********
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